The Legendary Edition won't really require any work from Bethesda, it's just the base game bundled with all the DLC. Also The Elder Scrolls: Online won't be their next biggest game, because Bethesda Game Studios isn't making TES:O, Zenimax Online is. While it's too early to tell a safe bet would be to assume that Fallout 4 is their next big title.

It is a horror game they're developing at the moment. The Evil Within, that is the name and they leaked the pictures and a video too. Pictures, that i did see but not the video. It looks pretty dark as in suitable for 18+.

It is a horror game they're developing at the moment. The Evil Within, that is the name and they leaked the pictures and a video too. Pictures, that i did see but not the video. It looks pretty dark as in suitable for 18+.

As @Pieni Mursu pointed out, The Evil Within is being developed by Tango Gameworks. The people who actually made Fallout 3 and Skyrim work for Bethesda Game Studios. People often don't understand the difference between a Publisher and a Developer: